There are few better ways to practice problem solving than competing in a puzzle hunt, and few better ways to exercise some creativity than writing an interesting puzzle. I helped CMU KGB and later PuzzlehuntCMU make puzzles and run puzzle hunts for several years; here are the puzzles that have made it to hunts (all puzzles solve to a one-phrase answer):
In November 2019, I launched a Kickstarter for my light drafting card game, Mint Condition Comics, published by neat games. You can read more about it here: http://www.playneatgames.com/ It came out in August/September 2020, and has a BoardGameGeek entry here: https://boardgamegeek.com/boardgame/290468/mint-condition-comics